36 CLASS GASTEROPODA. 
columella, which is marked with wide and oblique grooves. 
Their shell is oval or oblong, the aperture elevated as in buli- 
mus, and the margin tumid. Several are large. We are not 
certain whether they inhabit marshes, like the limnzi, or 
simply their borders, like the succinez. 
Auricula myosotis, Drap. iii. 16, 17.; Carychium myosotis, 
Féruss., is the only species in France. The animal has but 
two tentacula, and the eyes are at their base. From the 
shores of the Mediterranean. Add Voluta auris Mide, L.; 
Voluta auris Jude, &c. &c. 
Conovu.Lus, Lam., MELAMPES, Mont. 
Projecting folds in the columella, as in the auricule, but the 
margin of the aperture is not tumid, and the internal lip is 
finely striated. The general form of the shell is that of a cone, 
of which the spire forms the base. ‘They inhabit the rivers of 
the Antilles. (Voluta minuta, Lin. &c.) 
THE SECOND ORDER OF GASTEROPODA. 
THE NUDIBRANCHIATA 
HAVE neither shell nor pulmonary cavity; their gills are 
exposed on some part of the back. They are all hermaphro- 
dites and marine animals, frequently swimming in a reversed 
position, with the foot on the surface, concave, like a boat, 
and employing the margin of their mantle and their tentacula 
as oars. 
